The stellar content of UCHII regions the molecular cloud GRSMC 045.49+00.05

The targets of this work are G045.49+00.04 and G045.14+00.14 located in the same molecular cloud at a distance of about 8 kpc. Both regions contain a number of UC HII regions. The main objective is to characterize the embedded young stellar objects (YSOs), such as their mass, evolutionary age and age spread, spatial distribution, luminosity function. We identified and classified the YSOs of the molecular cloud using near-, mid-, and far-infrared photometric data. A spectral energy distribution (SED) fitting tool was used to determine the main parameters of the YSOs. Totally, we identified 2864 YSOs. The density distribution of the identified YSOs showed the presence of dense clusters in the UC HII regions. In general, the YSOs in these clusters have an evolutionary age larger than 10⁶ years with an age spread of a few Myr. The small age spread suggests that the clusters may originate from a single triggering event.